You can check perl's current directory with Cwd (no matter how unlikely it seems for something to be the cause of a defect, if you're stuck, it's better to check than "just know"). You can also check which files .pl perl sees in the current folder with:

use Data::Dump qw( pp );
pp <*.pl>;
[download]

I used Data::Dump instead of a simple print, because it will explicitly display characters that might go otherwise unnoticed. If you don't want to install it, you can use Data::Dumper and set $Data::Dumper::Useqq to 1